Why Are There So Many South Dakota License Plates in Mexico?

An odd thing that's puzzled folks vacationing in Mexico is that there seems to be an abundance of South Dakota license plates. In fact, there are so many, it doesn't make sense.

The first number on a South Dakota license plate is the county that the car is registered. For example, Pennington county where Rapid City is has a '2' starting its plates. In Sioux Falls you have either a '1' or a '44' depending on your relationship to 57th street.

When established in 1956 (and revised in 1987) the first nine counties were ordered by population. Starting with 10 they are in alphabetical order through Ziebach, with Oglala Lakota County (65) and Todd (67) rounding out the list.

Today the top 10 plate numbers and populations don't correlate anymore. 1 and 2 are still 1 and 2, but Lincoln (44) is now 3rd in population. Beadle is 4 but it's now 11th in population. See the list by population here.

On January 1, 2023, South Dakota started issuing a new license plate design for license plates.

So, let's take a look back at what South Dakota license plates looked like over the last 100 years.